[adgjlsfhk1]

the interface is simple, but modern solvers apply a ton of heuristics that often dramatically reduce problem size, so a naive implementation of a better algorithm that isn't hooked deeply into the core of an existing ilp solver is likely to be very slow

[FwarkALark]

Why is this exposed to the user? If it isn't exposed to the user, what on earth are you talking about?

[7thaccount]

Why would the API expose the heuristics to the user? Because an intelligent user can make minor adjustments and turn certain features on/off to sometimes dramatically increase performance depending on the problem.

[rocqua]

From what I gather the parent post is saying that it is easy to make a naive implementation of this improvement, but due to naivety of the implementation it will be slower in practice. Hence it is a lot of work (and thus difficult) to actually put this improvement into practice.